Changing father name

My father name is arjun Singh but I was staying with my uncle bharat raman Singh from childhood and when I took admissions in school I mentioned my own father and mother names but in guardian name I mentioned my uncle name...and now when I got my 10 th certificate...there was my uncle's name in place of my father name and but no change in my mother name...mother name is same as before but father name is wrong( uncle's name)... I tried to change it but some lawyer said it will take long time so it's better that you give 10 th class examination once again as your own father name and get the new certificate...but I did not want to waste my time and hence I gave 12 th examination as my uncle's name ( as in 10 th) and got 12 th pass certificate again on uncle's and mother name...now I m doing gradations 2 nd year but somebody told me that it's wrong that ur uncle and ur mother are your parents which is legally wrong bcz they according to this ur mother is ur uncle's wife...so u should change this name..hence I want to know what should I do or is this going to be any problem in my future... Can I change my uncle's name to my father name before getting my graduation degree bcz atleast I want this degree as correct name and what is the procedure of this problem...and also what I should do for getting 10 and 12 certificate as my own parents name... Pls suggest as soon as possible